Aspose pdf java PdfFileSignature setAuthority not working

Question

I'm trying to use Aspose pdf java to digitally sign a document. This is my code

public ByteArrayOutputStream signDocument(Document doc, String signedBy) throws Exception {

        PdfFileSignature pdfSignSingle = new PdfFileSignature();
        pdfSignSingle.bindPdf(doc);
        pdfSignSingle.setCertificate(prop.getSigningKeyStorePath(), prop.getKeystorePassword());
        PKCS7 signature = new PKCS7(prop.getSigningKeyStorePath(), prop.getKeystorePassword());
        pdfSignSingle.setSignatureAppearance(prop.getSimploudLogo());

        signature.setAuthority("Authority");
        signature.setDate(new Date());
        signature.setContactInfo("email");
        signature.setLocation("Location");
        signature.setReason("reason");
        pdfSignSingle.sign(1, true, new java.awt.Rectangle(100, 100, 200, 200), signature);

        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        pdfSignSingle.save(baos);
        pdfSignSingle.dispose();
        doc.dispose();
        return baos;
    }

In picture is shown how the signature looks in adobeReader.

As you can see both image and Authority are not shown. I tried image to be both in pdf and png format. I've also tried to make it smaller then Rectangle area. As for authority i really need it to be customizable so that text in first line in picture can be Signed by "customParameter"

Answer 1

The API offers another Class ie SignatureCustomAppearance which can further be used to set such properties for a signature such as DateSigned, Reason, Location, etc. Please check the following complete code snippet which can fulfill your requirements:

String inputFile = "doc.pdf";
String outSignedFile = "out_20.9.pdf";
// Create PdfFileSignature instance
com.aspose.pdf.facades.PdfFileSignature pdfSignSingle = new com.aspose.pdf.facades.PdfFileSignature();
// Bind the source PDF by reading contents of Stream
pdfSignSingle.bindPdf(inputFile);

PKCS7 pkcs = new PKCS7("mykey2.pfx", "pass");
pkcs.setAuthority("Authority");
pkcs.setDate(new Date());
pkcs.setContactInfo("email");
pkcs.setLocation("Location");
pkcs.setReason("reason");
pkcs.setImage(new FileInputStream("simpleLogo.png"));

SignatureCustomAppearance sca = new SignatureCustomAppearance();
sca.setDateSignedAtLabel(null);
sca.setDigitalSignedLabel(null);
sca.setShowReason(true);
sca.setShowLocation(true);
sca.setShowContactInfo(true);

pkcs.setCustomAppearance(sca);

pdfSignSingle.sign(1, true, new java.awt.Rectangle(100, 100, 200, 200), pkcs);
// Set image for signature appearance
//pdfSignSingle.setSignatureAppearance("simpleLogo.png");
// Save final output
pdfSignSingle.save(outSignedFile);

As mentioned in the comment below the question, the same inquiry was posted in Aspose.PDF official forum as well at " Aspose pdf java PdfFileSignature setAuthority not working " and a solution has also been provided there.